While the new core's are seeming to work fantastically, I remember Dennis saying he was going to add 2 ADF support for multiple disk games, but its gone silent.

Your right Dennis have rewriten the flopy controller from zilch again.
But it was not any good the preformence was worse then the first flopycontroller, after that I havn't hear from him sins.
He stated that a new flopycontroller was important for adding more things amon the multi flopy support.
Maybe with the new release from a few day's ago he will add it I don't know, we will see.